x+y=12 x*y+x*x=48 怎么解

x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算? 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. y/(x+y)-x/(x-y)=?怎么算? x+y=12 x*y+x*x=48 怎么解 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = y=x(x x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? |x|+y=12 |y|+x=6怎么解 (x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少 x+x+x+x+y+y+y=56 (x/8+x/12)*3+(x/12+x/24)y=x怎么解, x.y都是自然数,且x(x-u)-y(y-x)+12,求x.y得值快1且x(x-y)-y(y-x)=12 y=x^e^x怎么求导? x(x+y)=99怎么解 y=x^x+x^(x^x) 求y的导数怎么算啊 已知|x|+x+y=10 |y|+x-y=12 求 x+y=?